\documentclass[12pt]{article}

\title {State transition table}

\begin{document}
	\begin{center}
		{\large \textbf{\textsc{State transition table}}}\\\vspace{12mm}

		\begin{tabular}{ | l | l | l | l | l | l | l |}
			\hline
    			& N & !N & N $>$ 255 & seqEnd & rareSeqChar & stiOr $=$ len(rareSeq)-1 \\ \hline
			N & N & not N & N & exit & rareSeqChar & error	 		       \\ \hline
			not N & N & not N & error & exit & rareSeqChar & error		       \\ \hline
			rareSeqChar & N & not N & error & exit & rareSeqChar & !N	       \\ \hline
			exit  & error & error & error & error & error & error		       \\ \hline
				
		\end{tabular}
	\end{center}
\end{document}
